<template>
  <div class="goodsinfo-container">
      <transition
          @before-enter="beforeEnter"
          @enter="enter"
          @after-enter="afterEnter">
          <div class="ball" v-show="ballFlag" ref="ball"></div>
      </transition>    
      


    <!-- 商品轮播图区域 -->
    <div class="mui-card">
    <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <swiper :SwipeList = 'SwipeList' :isfull="false"></swiper>
        </div>
    </div>
</div>
    <!-- 商品购买区域 -->
    <div class="mui-card">
        <div class="mui-card-header">{{ goodsinfo.title }}</div>
         <div class="mui-card-content">
            <div class="mui-card-content-inner">
                <p class="price">
                    市场价：<del>￥{{ goodsinfo.market_price }}</del>&nbsp;&nbsp;销售价：<span class="now_price">￥{{ goodsinfo.sell_price }}</span>
                </p>
                <p>购买数量：<numbox @getcount="getSelectedCount" :max="goodsinfo.stock_quantity"></numbox></p>
                <p>
                    <mt-button type="primary" size="small">立即购买</mt-button>
                    <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
                </p>
            </div>
        </div>
    </div>
    <!-- 商品参数区域 -->
    <div class="mui-card">
      <div class="mui-card-header">商品参数</div>
      <div class="mui-card-content">
        <div class="mui-card-content-inner">
          <p>商品货号：{{ goodsinfo.goods_no }}</p>
          <p>库存情况：{{ goodsinfo.stock_quantity }}件</p>
          <p>上架时间：{{ goodsinfo.add_time | dateFormat }}</p>
        </div>
      </div>
      <div class="mui-card-footer">
          <!-- 绑定跳转事件 -->
        <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
        <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
      </div>
    </div>
</div>
</template>

<script>
import swiper from '../subcomponents/swiper.vue'
import numbox from "../subcomponents/goodsinfo_numbox.vue";

export default {
  data() {
    return {
        id: this.$route.params.id,  // 将路由参数对象中的 id 挂载到 data , 方便后期调用
        SwipeList: [],
        goodsinfo: {}, // 获取到的商品的信息
        ballFlag: false,
        selectedCount: 1 // 当子组件 把选中的数量 传给父组件的时候, 把选中的值保存到data上
    }
  },
  created() {
      this.getSwipeList();
      this.getGoodsInfo();
  },
  methods: {
    getSwipeList() {
       this.$http.get("api/getthumimages/" + this.id).then(result => {
          if( result.body.status === 0 ) {
              // 先循环轮播图数组的每一项，为 item 添加 img 属性，因为 轮播图 组件中，只认识 item.img， 不认识 item.src
              result.body.message.forEach(item => {
                item.img = item.src;
            });
            this.SwipeList = result.body.message;
          }
      });
    },
    getGoodsInfo() {
         // 获取商品的信息
        this.$http.get("api/goods/getinfo/" + this.id).then(result => {
            if (result.body.status === 0) {
          this.goodsinfo = result.body.message[0];
        }
      })
    },
    goDesc(id) {
        // 点击使用编程式导航跳转到 图文介绍的页面
       this.$router.push({ name: "goodsdesc", params: { id } });
    },
    goComment(id) {
       // 点击跳转到 评论页面
       this.$router.push({ name: "goodscomment", params: { id } });
    },
    beforeEnter(el) {
       el.style.transform = "translate(0, 0)";
    },
    enter(el, done) {
       el.offsetWidth;
    //    console.log(el)

    // 获取小球的 在页面中的位置
       const ballPosition = this.$refs.ball.getBoundingClientRect();

    // 获取 徽标 在页面中的位置
       const badgePosition = document
       .getElementById("badge")
       .getBoundingClientRect();

       const xDist = badgePosition.left - ballPosition.left;
       const yDist = badgePosition.top - ballPosition.top;

       el.style.transform = `translate(${ xDist }px,${ yDist }px)`;
       el.style.transition = "all 0.6s cubic-bezier(.4,-0.3,1,.68)";
       done();
    },
    afterEnter(el) {
       this.ballFlag = !this.ballFlag; 
    },
    addToShopCar() {
    // 添加到购物车
       this.ballFlag = !this.ballFlag;
    },
    getSelectedCount(count) {
       this.selectedCount = count;
       console.log("父组件拿到的数量值为:" + this.selectedCount); 
    }
  },
   components: {
    swiper,
    numbox    
  },
}
</script>

<style lang="scss" scoped>
.goodsinfo-container {
  background-color: #eee;
  overflow: hidden;
  .now_price {
    color: red;
    font-size: 16px;
    font-weight: bold;
  }
  .mui-card-footer {
    display: block;
    button {
      margin: 15px 0;
    }
  }
  .ball {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background-color: red;
  position: absolute;
  top: 390px;
  left: 146px;
  z-index: 99;
  }
}
</style>
